whitcomb



(No Model.)

E. W. WHITOOMB.

MINING MACHINE.

No. 398,298. n Patented Ie,b.19, 1889.

`n l n n 'l UNITED STATES PATENT OEEicE.

EDlVIN lV. XVI'IIIIC-Ohlll, OF CHICAGO, ILLINOIS, ASSIGNOR 'PO GEORGE D. XVIII'ICMB, OF SAME PLACE.

VININGHVIACHINE.

SPECIFICATION forming part of -Letters 'Patent No. 398,298, dated February 19, 1889.

Application tiled August l0, 1888. Serial No. 282,471. (No model.)

To all 1071.0711, t may con/cern.:

Be it known that I, EDWIN W. WHrrcoME, a citizen of the United States, residing at Chicago, in the county of (look and State of Illinois, have invented a certain new and useful Improvement in Mining-Machines, which is fully set forth in the following specification, reference' being had to the accompanying drawings, in which- Figure l is a plan view of a machine embodying my invent-ion; Fig. 2, a plan view of the supporti11g-brackets detached from the machine; 3, a sectional view taken on the line l l of Fig. i); Fig. 4.-, a sectional view taken on the line 2 2 of Fig. igFig. 5, a scctional view taken on the line 3 3 of Fig. 9, and Fig. (i a side elevation of the same detached.

Like letters rcfertolikc parts in all the figures of the drawings. Y

My invention relates to mining-machines, and more particularly to that class shown in Letters Patent No. 335,328, granteil February l2, 1396, to (Jie/orge D. Ihitcomln and in the other Letters Patent therein enumerated.

My invention relates more particularly to thc manner of mounting or supporting' said machine, and hasfor its object to provide means for that purpose whereby the machine will be rendered capable ofV use in a space of less height than heretofore and held up to its work more efficiently.

I will now proceed to describe a construction in which my invention is practically carried out in one form, and will then particularly point out in the claims those features which I deem to be new and desire to protect by Letters Patent.

ln the drawings, A represents the machine proper, which I have shown as ot' the forni shown and described :in said Letters Patent No. 335,329, although my invention is ot' course adapted lfor use in conjunction with any machine ot" the same general type.

B represents the axle or stub journals, which, in these n'lachines as heretofore constructed, receive the wheels which serve to support the machine. rlhe wheels, being' circular, of course extend as much above the axle as below and materially increase the height of the machine at its :forward portion.

means of a spring, f.

This increase of height materially affects the capabilities of the machine for use in low cuttings by rendering it difiieult or .impossible to advance the machine as far as desirable when the cuttings are low and contracted at the top. tages, I substitute for the wheels which have heretofore been employed brackets C, one for each side of the machine. These brackets are approximately triangular in their general form, and are each provided at their upper cnd with a sleeve-bearing, c, adapted to tit snugly over the stub-axles B. The sleeves C are, however, suliiciently loose on the axles to permit the sleeves to move freely thereon.

In order to hold the brackets C in line with each other and prevent independent movement of the two with respect to each other, they are connected by means of a transverse rod or bar, D, the ends of which are reduced, as shown at d, the said reduced ends passing through and pro jeeting beyond the brackets and being threaded to receive nuts d, by

means ot which the two brackets and the rod I) are rigidly connecteil. The rod D is provid ed at eacl 1Y end, just within the bracket, with a bearing portion, D, formed between the j bracket and a collar, d2, on the rod, and on the said bearing port-ions there are mounted rollers E, which serve to support the bracket, said rollers projecting below the brackets and resting upon the ground or platform. At cach end of each bracket there is located a roller, E', preferably somewhat smaller than the rollers E, and secured to the bracket by means of a suda-axle, c, and nut e', as shown in Fig. 5. It will be observed that, these auxiliary rollers being, just pointed out, of less diameter than the main supportiiig-rollers, said main. supporting-rollcrs project downward below the auxiliary rollers, as shown inorc particularlyv in Fi ft and 5, and thereby permit the bracket to be tilted either backward or forward, as desired, upon the main supporting-rollors, so as to hold the machine up to its work in a more satisfactory manner.

In conjunction with each main supportingroller E, I employ a bra-ke, F, which is' pivoted to the bracket C on the inner side thereof, and held normally away from the roller E by This brake is operated In order to obviatc these disadvan- IOO by means of a rod, F, pivoted thereto at its forward end, its rear end being provided with a treadle or foot-rest, f by means of which it may be operated.

It will be seen that by the use of the brackets just described a more compact supporting device is obtained, since nothing projects above the axles of the machine, which is therefore adapted to be used in more contracted spaces. The machine is free to tilt upon the brackets, and the brackets them selves are free to tilt upon the ground or platform upon'which they rest. The supporting rollers provide a ready means for moving the machine forward or back, while at the same time they hold the machine up to its work better than the large wheels heretofore employed. The operator, by placing his feet upon the treadles or foot-restsf, may force the brakes F against the main supportingrollers E, when desired, and may thus prevent the recoil of the machine or lessen the same to any desired extent, and thus hold it up to its work.

It is obvious that Various modifications in the details of construction may be made without departing from the principle of my invention, and l therefore do not wish to be understood as limiting mysell'l strictly lio the precise details hereinbelorc described, and shown in the drawings.

Having thus described my invention, what l claim as new, and desire to secure byLetters Patent, s-

l. The combination, with the mining-machine A and Vits central axle, B, of the brackets C, mounted loosely on said axle, and each provided with a central main supportingroller, E, and with an auxiliary roller, E at each end, said main roller projecting farther downward than the auxiliary rollers, substantially as and for the purposes specified.

2. The combination, with the mining-machine A and its central axle, B, of the brackets C, mounted loosely on said axle, the transverse rod D, connecting said brackets, the main supporting-,rollers E, mounted .on said rod, and the auxiliary supporting-rollers E', mounted at the ends of each bracket, said supporting-rollers having their axes of revolution in the same plane, and the auxiliary rollers being of smaller diameter than the main supporting-rollers, substantially as and for the purposes specified.

The combination, with the mining-machine and its supporting brackets and rollers, of the brakes F, pivoted on the brackets, springs f for holding said brakes normally away from the rollers, and operating-rods F', provided with treadles or foot-rests f,'sub stantially as and for the purposes specified.

EDWIN W. VHITGOMB.

Witnesses:

E. A. PARRIsH, l). J. THoMPsoN. 

